DocumentCode :
913078
Title :
What´s that deal with the DCT?
Author :
Blinn, James F.
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
Volume :
13
Issue :
4
fYear :
1993
fDate :
7/1/1993 12:00:00 AM
Firstpage :
78
Lastpage :
83
Abstract :
Discrete cosine transforms (DCTs) and discrete Fourier transforms (DFTs) are reviewed in order to determine why DCTs are more popular for image compression than the easier-to-compute DFTs. DCT-based image compression takes advantage of the fact that most images do not have much energy in the high-frequency coefficients. It is suggested that DCTs are more popular because fewer DCT coefficients than DFT coefficients are needed to get a good approximation to a typical signal, since the higher-frequency coefficients are small in magnitude and can be more crudely quantized than the low-frequency coefficients.<>
Keywords :
Fourier transforms; data compression; discrete cosine transforms; image processing; DCT-based image compression; discrete Fourier transforms; discrete cosine transforms; higher-frequency coefficients; Data compression; Fourier transforms; Image processing; discrete cosine transforms;
fLanguage :
English
Journal_Title :
Computer Graphics and Applications, IEEE
Publisher :
ieee
ISSN :
0272-1716
Type :
jour
DOI :
10.1109/38.219457
Filename :
219457
Link To Document :
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